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Configuration Utilities. NOTE: This module is deprecated and will be removed at the end of the v2.x versions of the utilities. Preferred config system after that is either to use true type-safe config with `net.morimekta.providence:providence-config` or to use a simple JSON or YAML library or java properties files. The semi-typesafe layered config did not really solve the problems I had hoped it would, and in essence this was just a helper for merging maps and getting pre-cast values out of it.

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/*
 * Copyright (c) 2016, Stein Eldar Johnsen
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package net.morimekta.config.format;

import net.morimekta.config.Config;
import net.morimekta.config.ConfigBuilder;
import net.morimekta.config.ConfigException;
import net.morimekta.config.impl.ImmutableConfig;
import net.morimekta.config.impl.SimpleConfig;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Properties;
import java.util.TreeSet;

/**
 * Format config into properties objects or files.
 */
public class PropertiesConfigParser implements ConfigParser {
    @Override
    public Config parse(InputStream in) {
        try {
            Properties properties = new Properties();
            properties.load(in);
            return parse(properties);
        } catch (IOException e) {
            throw new ConfigException(e, e.getMessage());
        }
    }

    /**
     * Parse the properties instance into a config.
     *
     * @param properties The properties to parse.
     * @return The config instance.
     */
    public static Config parse(Properties properties) {
        ConfigBuilder config = new SimpleConfig();
        for (Object o : new TreeSet<>(properties.keySet())) {
            String key = o.toString();
            if (isPositional(key)) {
                String entryKey = entryKey(key);
                if (config.containsKey(entryKey)) {
                    config.getCollection(entryKey).add(properties.getProperty(key));
                } else {
                    ArrayList